Pick the Swift problem. See who we would send.
Karim MansourSenior iOS Engineer94/ 100
Mariana SilvaMobile Engineer89/ 100
Joy AdeyemiEngineer85/ 10025,000 applied. 1,000 got in.
Five scored stages, all finished before a profile reaches you. Nobody skips a stage to hit a deadline.
From £15 an hour. That is the whole pricing page.
One hourly rate with our margin printed on every invoice, billed monthly. No placement fee and no notice period beyond two weeks.
£8,314/ monthEquivalent to £48 an hourWhat a Swift engineer does
Swift engineers build and maintain apps and services across the Apple ecosystem, most often iOS and iPadOS, and sometimes macOS, watchOS, visionOS, and server-side Swift with Vapor. In a modern stack, Swift usually sits at the client edge: it talks to REST or GraphQL APIs, handles secure local storage, coordinates offline behavior, instruments user flows, and ships through CI/CD into TestFlight and the App Store. In 2026, strong Swift work means using Swift 6 language mode, structured concurrency, SwiftUI where it fits, UIKit where control is needed, Swift Package Manager, XCTest or Swift Testing, and performance tools such as Instruments. A mid-level engineer can implement scoped features well. A senior Swift engineer designs app architecture, chooses the right boundaries between modules, prevents concurrency and memory bugs, reviews API contracts, improves build and release reliability, and makes tradeoffs that keep the product maintainable over multiple iOS releases.
Typical responsibilities
- Design, build, and maintain production Swift features for iOS and related Apple platforms using Swift 6.x, SwiftUI, UIKit, and structured concurrency.
- Own app architecture decisions, including modularization, dependency injection, navigation, state management, and boundaries between UI, domain, networking, and persistence layers.
- Integrate with REST, GraphQL, authentication, analytics, payments, push notifications, deep links, and feature flag systems while protecting user data and privacy.
- Improve app reliability through unit tests, integration tests, UI tests, Swift Testing or XCTest, crash analysis, logging, and performance profiling with Instruments.
- Manage release readiness through code review, CI pipelines, TestFlight builds, App Store submission support, signing, provisioning, and rollback planning.
- Mentor other engineers on Swift concurrency, memory management, API design, accessibility, localization, and maintainable patterns for long-lived Apple apps.
Must-have skills
- Strong production experience with Swift 6.x or Swift 5.9+ migrating toward Swift 6 language mode, including generics, protocols, error handling, optionals, and value semantics.
- Deep understanding of Swift concurrency: async/await, Task, TaskGroup, actors, MainActor, cancellation, Sendable, and common data-race pitfalls.
- Hands-on experience with SwiftUI and UIKit, including interoperability, lifecycle management, navigation, layout, accessibility, and performance tradeoffs.
- Ability to design maintainable app architecture using patterns such as MVVM, coordinators, unidirectional data flow, modular packages, and dependency injection.
- Practical knowledge of networking, persistence, and security: URLSession, Codable, REST or GraphQL, Keychain, Core Data or SwiftData, caching, and offline behavior.
- Proficiency with testing and quality tools: XCTest, Swift Testing, UI tests, mocks or test doubles, snapshot testing where useful, Instruments, and crash diagnostics.
- Comfort with Apple delivery workflows: Xcode, Swift Package Manager, code signing, provisioning profiles, TestFlight, App Store Connect, CI, and release branching.
Nice to have
- Experience with The Composable Architecture, Combine, Observation, AsyncSequence, or other state and reactive patterns used in modern Swift apps.
- Cross-platform Apple development experience across macOS, watchOS, tvOS, visionOS, widgets, App Intents, Live Activities, or extensions.
- Server-side Swift experience with Vapor, Hummingbird, Fluent, Postgres, Docker, and observability for backend services.
- Experience modernizing legacy Objective-C, UIKit, Combine, or RxSwift codebases into Swift 6-compatible, concurrency-safe modules.
- Familiarity with build tooling and developer productivity tools such as Tuist, Fastlane, SwiftLint, SwiftFormat, DocC, Danger, and GitHub Actions.
8 Swift interview questions that reveal real depth
These are the kinds of questions our engineers use in technical interviews. Each comes with what a strong answer sounds like.
Full set: 25 Swift questions by level, with red flags- Q1
How would you migrate a large Swift app toward Swift 6 strict concurrency without blocking feature delivery?
Strong answer: A strong candidate describes an incremental plan: enable warnings first, isolate modules, audit shared mutable state, add Sendable conformance carefully, and use actors or MainActor where ownership is clear. They avoid blanket @unchecked Sendable. They explain how to prioritize high-risk networking, caching, and view model code while keeping CI green and documenting temporary escape hatches.
- Q2
When would you choose SwiftUI, UIKit, or a mix of both for a new product area?
Strong answer: A strong answer weighs product needs, team skills, minimum OS support, custom interaction requirements, accessibility, testability, and long-term maintenance. They explain that SwiftUI is strong for declarative screens and rapid iteration, while UIKit still gives precise control for complex navigation, text, collection views, or legacy integration. They should discuss interoperability through UIHostingController and UIViewRepresentable.
- Q3
Describe how you handle cancellation and error propagation in an async Swift networking flow.
Strong answer: A strong candidate treats cancellation as normal control flow, not an error to hide. They use async/await, URLSession cancellation, Task cancellation checks, typed domain errors where useful, and clear mapping from transport errors to user-facing states. They avoid detached tasks unless justified and explain how view lifecycle, retry logic, and loading indicators stay consistent.
- Q4
What architecture would you use for a growing iOS app with multiple teams working in the same codebase?
Strong answer: A strong answer focuses on module boundaries, ownership, build times, and clear dependencies rather than naming one pattern as universal. They may propose SPM modules for features, domain, networking, design system, and test support. They discuss dependency injection, navigation ownership, API contracts between modules, and rules that prevent feature code from leaking into shared layers.
- Q5
How do you find and fix memory leaks or performance problems in a Swift app?
Strong answer: A strong candidate mentions Instruments, Allocations, Leaks, Time Profiler, signposts, MetricKit, and crash or hang reports. They look for retain cycles in closures, delegates, Combine subscriptions, and tasks. They also discuss measuring before optimizing, reproducing on real devices, checking main-thread work, reducing unnecessary view recomputation, and validating the fix with repeatable profiling.
- Q6
How would you design local persistence for an app that needs offline support and conflict handling?
Strong answer: A strong answer starts with data ownership and synchronization rules. The candidate compares SwiftData, Core Data, SQLite or GRDB, and lightweight file storage based on query complexity and migration needs. They discuss stable IDs, pending operations, conflict resolution, background sync, schema migrations, encryption or Keychain use for secrets, and test coverage for edge cases.
- Q7
What makes a Swift API pleasant and safe for other engineers to use?
Strong answer: A strong candidate talks about clarity at the call site, value semantics where appropriate, narrow protocols, meaningful errors, immutability by default, documentation for non-obvious behavior, and avoiding over-generic abstractions. They consider concurrency annotations, actor isolation, Sendable, access control, and sensible defaults. They should also mention source stability and how API design affects testing.
- Q8
How do you approach testing a Swift feature that includes UI, networking, and persistence?
Strong answer: A strong answer separates concerns. The candidate unit tests business logic with injected dependencies, tests networking with protocol-based clients or URLProtocol, tests persistence with isolated stores, and uses UI tests only for critical user flows. They discuss deterministic async tests, avoiding real services in CI, snapshot tests when valuable, and making failures easy to diagnose.
Senior Swift engineer job description
A ready-to-paste template. Or skip the posting entirely: send it to us as your brief and get a scored shortlist in 48 hours.
About the role We are hiring a Senior Swift Engineer to build and improve production apps across the Apple ecosystem. You will work on user-facing features, app architecture, performance, reliability, and release quality. The codebase uses modern Swift, SwiftUI, UIKit, Swift Package Manager, async/await, and Apple platform tooling. What you'll do Design and ship Swift features for iOS and related Apple platforms. Own architecture decisions for modules, state management, navigation, and dependency injection. Integrate with backend APIs, authentication, analytics, push notifications, and local persistence. Improve app quality with tests, profiling, crash analysis, and clear code review. Support CI, TestFlight, App Store delivery, code signing, and release readiness. Mentor engineers on Swift concurrency, memory management, accessibility, and maintainable patterns. What you'll bring Strong production Swift experience, including Swift 6 language mode or migration work. Deep knowledge of async/await, actors, MainActor, Sendable, and cancellation. Practical experience with SwiftUI and UIKit in real apps. Good judgment around architecture, testing, performance, and tradeoffs. Clear communication in a remote engineering team.
What you get with Swift
Pre-Vetted Expertise
Every Swift developer on OctogleHire passes a rigorous vetting process covering technical skills, communication, and problem-solving ability.
Start in Days, Not Months
Skip the lengthy recruitment cycle. Our Swift engineers are ready to integrate with your team and start delivering within days.
Up to 60% Cost Savings
Access world-class Swift talent at a fraction of the cost of local hires, without compromising on quality or experience.
Risk-Free Trial Period
Every Swift engagement starts with a trial period. If you're not completely satisfied, you pay nothing.
The engagement, as a spec sheet
How OctogleHire compares
Vetting
Resume screening only
Self-reported skills
5-stage technical vetting (1 in 25 pass rate)
Time to Hire
6–12 weeks
Weeks of filtering
48 hours to first match
Cost
$20K–$40K placement fees
Low rates, variable quality
40–60% less, no placement fee
Compliance
You manage it
You manage it
Fully managed (30+ countries)
Replacement
30–90 days (if any)
None
14–30 day replacement guarantee
Support
Account rep (9-5)
Ticket system
Dedicated account manager
“We in need of a handful of developers for our internal CRM build after speaking with multiple agencies and receiving some quotations we sat down with Yaseen from Octogle and we were pleasantly surprised to see what was available for us within their talent pool. we took on three developers saving upwards of circa £6000 per month and developing the software in record time exactly how we wanted it. Highly suggest anyone to use octogle hire if you’re looking for a cost-effective high-quality software development solution.”
Questions engineering leaders ask
Hire a Swift developer when the product depends on Apple platform quality, native performance, App Store features, complex UI, device APIs, or long-term iOS maintainability. Cross-platform frameworks can work well for simpler shared experiences, but they add abstraction around Apple APIs. Many teams still choose Swift for the iOS app and share only backend, design, or business logic where it makes sense.
Test real production judgment, not syntax trivia. Focus on Swift concurrency, memory management, app architecture, SwiftUI and UIKit tradeoffs, networking, persistence, testing, profiling, and release workflows. Ask the candidate to reason through a feature from API contract to offline behavior, UI state, tests, and App Store delivery. Senior candidates should explain tradeoffs and failure modes clearly.
It depends on codebase size, documentation, CI health, and access to product context. A strong onboarding plan should include Xcode setup, signing access, architecture notes, API documentation, test data, crash dashboards, and a small first ticket. Experienced Swift engineers can contribute quickly when the build works locally and someone explains release rules, module boundaries, and current technical debt.
Use a freelance Swift developer for defined projects such as a feature build, migration, performance audit, SDK integration, or release rescue. Hire full-time when you need ongoing product ownership, roadmap input, architecture stewardship, and long-term maintenance. The risk with short engagements is knowledge loss, so insist on documentation, tests, and clean handoff if the work is not permanent.
Yes, if the team is deliberate about collaboration. Remote Swift work benefits from clear tickets, reproducible builds, stable CI, written architecture decisions, code review standards, and shared access to TestFlight builds, logs, and crash reports. Senior Swift engineers should be comfortable explaining tradeoffs asynchronously, recording context in pull requests, and pairing when debugging device-specific or release issues.
A mid-level Swift engineer can deliver scoped features with guidance and write solid code inside existing patterns. A senior Swift engineer improves the patterns themselves. They spot architectural drift, prevent concurrency and memory bugs, guide API design, mentor others, improve release reliability, and know when to use SwiftUI, UIKit, actors, modules, or simpler code based on product constraints.
You need Objective-C experience if your app has legacy Objective-C, older SDKs, manual bridging, or mixed UIKit code that still matters. For a new Swift app, it is usually less important. A senior Swift engineer should at least understand interoperability, bridging headers, nullability, reference semantics, and how to modernize Objective-C safely without rewriting stable code unnecessarily.
Common mistakes include overvaluing small coding puzzles, ignoring App Store and release experience, treating SwiftUI as a complete replacement for UIKit, and not testing concurrency knowledge. Another mistake is hiring only for feature speed while neglecting build health, testing, accessibility, and crash diagnostics. Good Swift hiring checks whether the engineer can keep an app maintainable across multiple Apple platform releases.
You'll receive 3–5 vetted candidate profiles within 48 hours of your demo call. Most companies go from first intro to signed contract in under 5 business days — compared to 6–12 weeks with traditional agencies.
Every developer passes a 5-stage process: application screening, stack-specific technical assessment, live system design interview, soft-skills evaluation, and reference checks. From over 25,000 applicants reviewed, only 1,000 have been accepted into our network.
OctogleHire engineers start at £15/hr (about $19), with senior engineers at about £24/hr. That is roughly 50–65% less than the loaded cost of an equivalent in-house hire in the UK, US or Australia — a senior UK hire costs about £48/hr once employer costs are included. There are no upfront fees or placement commissions; you pay one published hourly rate once your engineer starts.
Every placement includes a risk-free replacement guarantee — 14 days on our On-Demand plan and 30 days on our Marketplace plan. If a developer doesn't meet your expectations, we'll find a replacement at no additional cost and manage the transition for you. Our replacement rate is under 6%.
Send the brief. Meet Swift engineers on Thursday.
Twenty minutes with an Octogle engineer, then three to five scored profiles inside 48 hours. Free to post, with a replacement guarantee on every placement.